For a list of all members of this type, see HeaderKey members.
Public Fields
| Name | Description | |
|---|---|---|
 | AcceptLanguage | "Accept-Language". Language(s) for auto-responses. RFC 4021. |
| AutoSubmitted | "Auto-Submitted". Automatically submitted indicator. RFC 4021. |
| Bcc | "bcc". Can be set in the header to indicate where "blind carbon copies" should be sent, but is not included in the encoded header. |
| Cc | "Cc". Carbon-copy recipient mailbox(es). RFC 822, 1123. |
| Comments | "Comments". Additional comments about the message. RFC 822. |
| ContentDescription | "Content-Description". Description of a particular body part of a message. RFC 1521. |
| ContentDisposition | "Content-Disposition". Whether a MIME body part is to be shown inline or is an attachment; can also indicate a suggested filename for use when saving an attachment to a file. RFC 1806. |
| ContentId | "Content-ID". Unique ID of this message. RFC 1521. |
| ContentLanguage | "Content-Language". RFC 1766. |
| ContentMD5 | "Content-MD5". Checksum of content to ensure it has not been modified. RFC 1864. |
| ContentTransferEncoding | "Content-Transfer-Encoding". Coding method used in a MIME message body. RFC 1521. |
| ContentType | "Content-Type". Format of content. RFC 1049, 1123, 1521, 1766. |
| Date | "Date". Date and time message was written. RFC 822, 1123, 1036. |
| DeferredDelivery | "Deferred-Delivery". Deferred delivery information. RFC 4021. |
| DeliveryReport | "Delivery-Report" |
| DispositionNotificationOptions | "Disposition-Notification-Options". Disposition notification options. RFC 4021. |
| DispositionNotificationTo | "Disposition-Notification-To". Mailbox for sending disposition notification. RFC 4021. |
| Encrypted | "Encrypted". Message encryption information. RFC 4021. |
| From | "From". Mailbox of message author. RFC 822, 1123, 1036. |
| InReplyTo | "In-Reply-To." Reference to message which this message is a reply to. RFC 822. |
| Keywords | "Keywords". Message key words for data base retrieval. RFC 822, 1036. |
| LatestDeliveryTime | "Latest-Delivery-Time". Latest delivery timer requested. RFC 4021. |
| ListArchive | "List-Archive". URL of mailing list archive. RFC 4021. |
| ListHelp | "List-Help". URL for mailing list information. RFC 4021. |
| ListID | "List-ID". Mailing list identifier. RFC 4021. |
| ListOwner | "List-Owner". URL for mailing list owner's mailbox. RFC 4021. |
| ListPost | "List-Post". URL for mailing list posting. RFC 4021. |
| ListSubscribe | "List-Subscribe". URL for mailing list subscription. RFC 4021. |
| ListUnsubscribe | "List-Unsubscribe". URL for mailing list unsubscription. RFC 4021. |
| MessageContext | "Message-Context". Type or context of message. RFC 4021. |
| MessageID | "Message-ID". Unique ID of this message. RFC 822, 1036. |
| MimeVersion | "MIME-Version". An indicator that this message is formatted according to the MIME standard, and an indication of which version of MIME is utilized. RFC 1521. |
| OriginalMessageID | "Original-Message-ID". Original message identifier. RFC 4021. |
| OriginatorReturnAddress | "Originator-Return-Address". RFC 4021. |
| Path | "Path" |
| Priority | "Priority". Message priority. RFC 1327. |
| Received | "Received". Trace of MTAs which a message has passed. RFC 822, 1123. |
| References | "References". Related message identifier(s). RFC 822, 1036. |
| ReplyTo | "Reply-To". RFC 822, 2822. |
| ReturnPath | "Return-Path". Used to convey the information from the MAIL FROM envelope attribute in final delivery, when the message leaves the SMTP environment in which "MAIL FROM" is used. RFC 821, 1123. |
| ReturnReceiptTo | "Return-Receipt-To". |
| Sender | "Sender". The person or agent submitting the message to the network, if other than shown by the From: header. RFC 822, 1123. |
| Status | "Status". A non-standard header field used by some servers to indicate the status of delivery for the message. |
| Subject | "Subject". Topic of message. RFC 822, 1036. |
| To | "To". Primary recipient mailbox(es). RFC 822, 1123. |
| XPriority | "X-Priority". Message priority. RFC 4021. |
See Also